<h2>Problem 19</h2>
<div style="color:#666;font-size:80%;">14 June 2002</div><br />
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<p>You are given the following information, but you may prefer to do some research for yourself.</p>
<ul>
<li>1 Jan 1900 was a Monday.</li>
<li>Thirty days has September,<br />
April, June and November.<br />
All the rest have thirty-one,<br />
Saving February alone,<br />
Which has twenty-eight, rain or shine.<br />
And on leap years, twenty-nine.</li>
<li>A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.</li>
</ul>
<p>How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?</p>

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